Jerry Posted September 16, 2013 Report Share Posted September 16, 2013 I was flying this past weekend when the engine light came on and then after about 2 minutes went off again. I had been cruising at 6,000' for about 35 minutes, all was well. When I reduced my rpm from 4,900 to 3,400 as I descended to 2,000' in preparation for landing, I added throttle once at 2,000' increasing rpm to 4,600 and the engine light began to flash and a rpm warning came on. The engine was still running very smooth and all other gauges were reading normal, then apter about 2 minutes of that, the light went out and everything read normal through to landing. What the heck was that all about. Don't mind telling you, that made me a little nervous for about two minutes, not to mention my passenger. Any thoughts would be appreciated. Link to comment Share on other sites More sharing options...
Doug G. Posted September 16, 2013 Report Share Posted September 16, 2013 The standard fix seems to be ground connections for most things electrical on these machines, especially if they are intermittent and/ or odd. (Others may have another opinion however.) Link to comment Share on other sites More sharing options...
Roger Fane Posted September 16, 2013 Report Share Posted September 16, 2013 It was a warning of low oil temperature and high rpm. The engine can cool down fairly quickly in low rpm descent's. Link to comment Share on other sites More sharing options...
Doug G. Posted September 16, 2013 Report Share Posted September 16, 2013 Odd, I have never had a low oil temp indication in any descent, even with very cold OAT. My CTLS does have an oil thermostat so maybe that handles it. And, 4600 certainly isn't a high RPM. I often fly at 5000 rpm for cruise. Link to comment Share on other sites More sharing options...
Roger Lee Posted September 16, 2013 Report Share Posted September 16, 2013 If it was an engine temp light, If you cooled down the oil temp below 120F the acceptable rpm limit is 2500 and you were above that. So once you added throttle and leveled off the engine heated back up and the oil temp went back over 120F and the low engine temp light went out. Link to comment Share on other sites More sharing options...
Jim Meade Posted September 17, 2013 Report Share Posted September 17, 2013 I've had this happen to me a couple of times. Fairly steep descent from 6-8k on a cool day with low throttle will do it. Has happened after being held high by ATC and then asked to descent quickly. As was suggested, add a little throttle. Link to comment Share on other sites More sharing options...
Jerry Posted September 17, 2013 Author Report Share Posted September 17, 2013 It was a warning of low oil temperature and high rpm. The engine can cool down fairly quickly in low rpm descent's. Hi Roger, that's exactly what had happened, low oil temp and high RPM warning came on. Oil temp had dropped below 100F and when I reengaged the throttle it was only at 4650RPM. I'm guessing this is a similar case as to warmimng the engine up prior to flight when oil temp exceeds 124F and the RPM spectrum spreads? Link to comment Share on other sites More sharing options...
Jerry Posted September 17, 2013 Author Report Share Posted September 17, 2013 So Roger Lee, is this condition ok? To prevent this from happening again I should not let the engine fall below 120F? Link to comment Share on other sites More sharing options...
Jerry Posted September 17, 2013 Author Report Share Posted September 17, 2013 I was flying this past weekend when the engine light came on and then after about 2 minutes went off again. I had been cruising at 6,000' for about 35 minutes, all was well. When I reduced my rpm from 4,900 to 3,400 as I descended to 2,000' in preparation for landing, I added throttle once at 2,000' increasing rpm to 4,600 and the engine light began to flash and a rpm warning came on. The engine was still running very smooth and all other gauges were reading normal, then apter about 2 minutes of that, the light went out and everything read normal through to landing. What the heck was that all about. Don't mind telling you, that made me a little nervous for about two minutes, not to mention my passenger. Any thoughts would be appreciated. Thank you all for your help and suggestions. Moving forward I'll keep a close eye on the oil temp to not let it fall below 120 during long decents, especially when the outside temp was as cool as it was during that flight. Link to comment Share on other sites More sharing options...
Roger Lee Posted September 17, 2013 Report Share Posted September 17, 2013 It won't hurt a thing since it doesn't run that way all the time and it only last a few minutes. For most it doesn't happen very often so don't worry about it. You can't shock cool a 912 because of the water cooling. The panel light is an attention getter to make you pay attention and look at whatever is going on, but it's not always an emergency or real problem. Link to comment Share on other sites More sharing options...
FastEddieB Posted September 17, 2013 Report Share Posted September 17, 2013 You can't shock cool a 912 because of the water cooling. Rumor has is that "shock cooling", even in an aircooled engine, is an old wive's tale. But that's a whole 'nother... Link to comment Share on other sites More sharing options...
Jim Meade Posted September 17, 2013 Report Share Posted September 17, 2013 Rumor has is that "shock cooling", even in an aircooled engine, is an old wive's tale. But shock heating is not. Think detonation. Link to comment Share on other sites More sharing options...
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